Change H1B from CP to COS

Hi I was selected by H1B lottery, but it's really pissing me off that Fragomen lawyer didn't inform or ask me, but by default change file my case as consular processing. I definitely prefer to stay in US and smoothly transition to H1B by COS (change of status) from OPT, because the immigration atmosphere is horrible now and there's huge chance my H1B VISA will be checked for long, which may affect my employment.

The fragomen paralegal told me I cannot change it after file. Is that true or just a lie to save them the work? I read I-129 form and it seems we could request amendment. I have plenty of OPT time and it won't be problem even the amend will delay my case, and I'm also willing to pay the fee myself.

H1B VISA usually will take 1~2 months before issued, so I will get stuck in my country for long time thus cannot work at US. Yes, I could remote work at home, if my boss is nice....But that'll still be annoying. The silly Fragomen lawyers won't ever ask me about this, and forces me to go back stamping!